I've only used this opener once, and although i'm not a big fan of cold approaching, you guys should try it.
It's when the girl you like is around her friends. Go up to her and say something similiar to " hey me and my friend couldn't help but notice you guys, and we were wondering, which one of you is the tough chick?"
When I used it, it went pretty well. I mean, I didn't get rejected and I stayed there for a few minutes before ejecting, but I was a nervous wreck when I did it lol. Try it out and see how it goes. I posted it in my "Senior year field reports" Somewhere, just skim around it until you find it.